Table of Contents
Epilepsy Research and Treatment
Volume 2010, Article ID 310753, 6 pages
http://dx.doi.org/10.1155/2010/310753
Research Article

Connexin36 Gap Junction Blockade Is Ineffective at Reducing Seizure-Like Event Activity in Neocortical Mouse Slices

1Department of Anesthesiology, Waikato Clinical School, Waikato Hospital, University of Auckland, Pembroke St, Hamilton 3204, New Zealand
2Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht 6200, The Netherlands

Received 15 October 2010; Accepted 14 December 2010

Academic Editor: Scott Baraban

Copyright © 2010 Logan J. Voss et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Despite much research, there remains controversy over the role of gap junctions in seizure processes. Many studies report anticonvulsant effects of gap junction blockade, but contradictory results have also been reported. The aim of this study was to clarify the role of connexin36 (Cx36) gap junctions in neocortical seizures. We used the mouse neocortical slice preparation to investigate the effect of pharmacological (mefloquine) and genetic (Cx36 knockout mice (Cx36KO)) manipulation of Cx36 gap junctions on two seizure models: low-magnesium artificial cerebrospinal fluid (ACSF) and aconitine perfusion in low-magnesium ACSF. Low-magnesium- (nominally zero) and aconitine- (230 nM) induced seizure-like event (SLE) population activity was recorded extracellularly. The results were consistent in showing that neither mefloquine (25 μM) nor genetic knockdown of Cx36 expression had anticonvulsant effects on SLE activity generated by either method. These findings call into question the widely held idea that open Cx36 gap junctions promote seizure activity.